Swimming pool cofferdam



FIG. 1 is a perspective view of a swimming pool cofferdam embodying my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a side elevational view, the opposite side being a mirror image thereof.

The broken line showing of swimming pool side and water level in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a swimming pool cofferdam, as shown and described. 